Apparatus for intermitting beam of light for use in gas analyzer
AssigneeHoriba, Ltd.
InventorsKimio Miyatake, Kenji Takeda
Life of this patent
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Abstract
An apparatus for intermitting beams of light for use in a gas analyzer in which a rotary shaft of a chopper is supported by first and second ball bearings. An outside ring of the first ball bearing is fixedly mounted on a bearing housing and either an inside ring or an outside ring of the second ball bearing is adapted to be movable in the thrust or axial direction relative to the rotary shaft, whereby the second ball bearing is movably energized in the thrust direction by an elastic member to eliminate shake of the rotary shaft due to play in the ball bearings and thus reduce modulation noise to improve measuring accuracy of the gas analyzer.
Claims14
An apparatus for intermitting beams of light for use in a gas analyzer, characterized by that a rotary shaft of a chopper is supported by two ball bearings, an outside ring of one ball bearing being fixedly mounted on a bearing housing, and an outside ring or inside ring of another ball bearing being adapted to be movable in the thrust direction relative to said bearing housing or rotary shaft and movably energized in the thrust direction by an elastic member.
In an apparatus for intermitting beams of light in a gas analyzer including a chopper mounted on a rotary shaft supported for rotation in a housing by first and second ball bearings which are spaced apart in an axial direction which is parallel to the axis of rotation of the rotary shaft, the improvement comprising:
- said first ball bearing including an outside ring fixedly mounted on said housing;
- said second ball bearing including a movable ring comprising one of an inside ring and an outside ring of said second ball bearing, said movable ring being slidable along said rotary shaft in said axial direction;
- and
- biasing means associated with said movable ring for biasing said movable ring in said axial direction so that play in said first and second ball bearings is reduced and modulation noise generated when a beam of light is intermitted by said chopper is reduced and measuring accuracy of said gas analyzer is improved.
Dependencies are inferred from the claim text.